Here's a great poster featuring a beautiful image from deep space
what do you think of this one? I bumped into it and thought it was cool. By Nasaworld,
another talented creative from the Zazzle community!
tagged with: astronomy, space, nasa, best, galaxy, original, popular, cheapest, nebulae, art, custom, quality, christmas gift, gift, gift idea, birthday gift posters, wedding gift posters, mens gift, office gift An interstellar cloud of gas will remain in hydrostatic equilibrium as long as the kinetic energy of the gas pressure is in balance with the potential energy of the internal gravitational force. Mathematically this is expressed using the virial theorem, which states that, to maintain equilibrium, the gravitational potential energy must equal twice the internal thermal energy.[13] If a cloud is massive enough that the gas pressure is insufficient to support it, the cloud will undergo gravitational collapse. The mass above which a cloud will undergo such collapse is called the Jeans mass. The Jeans mass depends on the temperature and density of the cloud, but is typically thousands to tens of thousands of solar masses.[2] This coincides with the typical mass of an open cluster of stars, which is the end product of a collapsing cloud.
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